Abstract
In this paper, we estimate the Cosmic Microwave Background (CMB) temperature using the data of the monopole spectrum from the Cosmic Background Explorer/ Far-Infrared Absolute Spectrophotometer (COBE/FIRAS). Utilising the idea of straight-line fitting, we obtain the temperature and chemical potential. The temperature of the CMB is found to be (2.725007 ± 0.000024) K (only statistical error) by using the monopole spectrum. Handling the data of the monopole spectrum the chemical potential is obtained as (-1.1 ± 3.4) × 10–5 with an upper bound |µ| < 5.7 × 10–5 (95% confidence level). The amplitude of the CMB dipole is found to be, Tamp = (3.47 ± 0.11) mK. We estimate an upper limit for the rms value of the fluctuation in chemical potential as Δµ < 1.2 × 10–4 (95% confidence level). The upper limit of y- distortion is calculated as y < 1.0 × 10–4 (95% confidence level).
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The data sets used and/or analysed during the current study are available from the corresponding author upon reasonable request.
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Acknowledgements
We would like to thank the Department of Physics of Birla Institute of Technology, Mesra, Ranchi for providing us a wonderful environment during our research. We are very much grateful to Pranjali Bhattacharjee for her help and support. We would also like to thank B. Pathak and Rajeev Kumar (Department of Physics, BIT Mesra, Ranchi) for encouraging us in our research. Authors also thank reviewer for his valuable suggestion to improve the manuscript.
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Somita Dhal has performed the analysis, computational work and wrote the main manuscript text with figure. Sneha Singh has performed the analysis, computational work and wrote the main manuscript. Koustav Konar performed statistical analysis and computational work. Ratan Kumar Paul conceived the idea and executed the mathematical model, performed the computational work, wrote the manuscript, and supervised the overall research work. All authors read and approved the final manuscript.
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Dhal, S., Singh, S., Konar, K. et al. Calculation of Cosmic microwave background radiation parameters using COBE/FIRAS dataset. Exp Astron 56, 715–726 (2023). https://doi.org/10.1007/s10686-023-09904-w
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DOI: https://doi.org/10.1007/s10686-023-09904-w